Madocite
A variety of Minerals
What is Madocite?
Madocite is a mineral with a general formula of Pb17(Sb,As)16S41. Madocite was named for the locality of discovery, Madoc, Ontario, Canada. It is found in the marbles of the Precambrian Grenville Limestone. It is orthorhombic (rectangular prism with a rectangular base) and in the point group mm2. Its crystals are elongated and striated along [001] to a size of 1.5 mm. Madocite is anisotropic and classified as having high relief. It also displays strong pleochroism. Madocite is found in small clusters in marble pits (near Madoc, Ontario), and was originally categorized in the 1920s as an unidentified sulfosalt mineral in an assemblage of pyrite, sphalerite, and jamesonite in marble. Later research was done by John L. Jambor in the 1960s who went to the site and collected samples of the assemblages.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Madocite before comparing listings or appraisals.
Size & Weight
Larger, intact specimens usually command higher prices.
Rarity & Demand
Scarce material or popular varieties sell at a premium.
Condition & Finish
Chips, repairs, and heavy wear lower value; clean prep helps.
Treatment & Provenance
Untreated specimens with documented locality are prized.
Madocite Localities Map
See where Madocite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- Grey-black
- Hardness (Mohs)
- 3
- Streak
- Grey-brack
Chemical Properties
- Chemical Formula
- Pb19(Sb,As)16S43
- Elements
- As, Pb, S, Sb
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Madocite FAQs
How do I identify Madocite?
Madocite can be identified by its hardness of 3 on the Mohs scale, Grey-black color. Look for these key characteristics when examining specimens.
What color is Madocite?
Madocite typically appears in Grey-black. Color can vary depending on impurities and formation conditions.
How hard is Madocite?
Madocite has a hardness of 3 on the Mohs scale. This makes it a soft mineral that can be scratched easily.
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